Honeycomb filter

Abstract

A honeycomb filter includes a pillar-shaped honeycomb structure having a porous partition wall disposed so as to surround a plurality of cells which serve as a fluid through channel extending from a first end face to a second end face; and a plugging portion provided at either an end on the first end face side or the second end face side of the cell; wherein a thickness of the partition wall is 203 to 254 μm, a porosity of the partition wall measured by the mercury press-in method is 55 to 70%, an average pore diameter of the partition wall measured by the mercury press-in method is 20 to 25 μm, and the partition wall has an average base material neck diameter of 11 to 18 μm for a base material neck part in which an actual part of a porous base material constituting the partition wall is locally narrowed.

What is claimed is: 
     
         1 . A honeycomb filter comprising: a pillar-shaped honeycomb structure having a porous partition wall disposed so as to surround a plurality of cells which serve as a fluid through channel extending from a first end face to a second end face; and
 a plugging portion provided at either an end on the first end face side or the second end face side of the cell; wherein   a thickness of the partition wall is 203 to 254 μm,   a porosity of the partition wall measured by the mercury press-in method is 55 to 70%,   an average pore diameter of the partition wall measured by the mercury press-in method is 20 to 25 μm, and   the partition wall has an average base material neck diameter of 11 to 18 μm for a base material neck part in which an actual part of a porous base material constituting the partition wall is locally narrowed.   
     
     
         2 . The honeycomb filter according to  claim 1 , wherein a pore volume rate of pores having a pore diameter of 10 μm or less is 0.1 to 3.0% with respect to the total pore volume of the partition wall measured by the mercury press-in method. 
     
     
         3 . The honeycomb filter according to  claim 1 , wherein a cell density of the honeycomb structure is 43.4 to 49.6 cells/cm 2 . 
     
     
         4 . The honeycomb filter according to  claim 1 , wherein the partition wall is made of a material containing cordierite as a main component. 
     
     
         5 . The honeycomb filter according to  claim 1 , wherein a pore diameter D10 at which the cumulative pore volume is 10% of the total pore volume is 16 to 19 μm in a pore diameter distribution of the partition wall measured by the mercury press-in method.